KR20220138533A - Porous agricultural double black and white mulching laminated film and its manufacturing method - Google Patents

Abstract

The present invention relates to a porous agricultural double black and white mulching laminated film, and more specifically, to a porous agricultural double black and white mulching laminated film, which includes a white mulching film layer on an upper layer and a black mulching film layer on a lower layer, thereby having excellent durability, exhibiting excellent insulation and heat shielding effects, to maintain the temperature of the ground at a constant temperature, and having excellent a weeding effect.

Description

Porous agricultural double black and white mulching laminated film and manufacturing method thereof

The present invention relates to a double black and white mulching laminated film for porous agricultural use, by providing a double black and white mulching film constituting a white mulching film layer in the upper layer and a black mulching film layer in the lower layer, thereby having excellent durability and excellent thermal insulation and heat shielding effect. It relates to a porous agricultural double black-and-white mulching laminated film that can maintain the temperature at a constant temperature and has an excellent weeding effect.

Plant cultivation areas for major medicinal crops in Korea have reached saturation, and it is expected that the cultivable area for plants will continue to decrease due to global warming. It is necessary to develop a low-temperature maintenance mulching film that can solve the phenomenon.

In particular, in the case of perennial medicinal crops, when high-temperature damage caused by abnormal weather occurs, it affects the growth and quality of the following year, and the effect continues from year to year and affects until the final harvest. You need to have the skills you can.

As the conventional mulching film used for this purpose, a nonwoven mulching film, a vinyl mulching film, a light-shielding mesh mulching film, and the like were generally used.

In the case of a mulching film composed of a nonwoven fabric, it has high moisture permeability and air permeability, but has a disadvantage in that it is heavy in weight and particularly weak in durability and may be damaged by external factors such as rain and wind. In the case of vinyl mulching, durability and thermal stability are good, but ventilation and moisture permeability are very low due to the nature of vinyl, so it is inconvenient to configure a separate hole, and there is a disadvantage that weeds can grow between the holes.

When the light shielding net is used as a mulching film, there is an advantage of excellent durability, but there is a point that it is not easy to work because it is too heavy and bulky.

Therefore, there is a need for a mulching film that can be used for a long period of time due to its good durability, and has excellent moisture permeability and air permeability to suppress soil high temperature.

In addition, in the case of the conventional mulching film, white and black are mainly used. In the case of white, direct sunlight reflectance is high, so that the temperature rise of the soil can be suppressed, but weeds can also be propagated accordingly, and in the case of black, all sunlight is absorbed. Due to the high temperature of the soil by absorption, there may be a problem that the plant may die.

Therefore, it is necessary to research and develop a multifunctional mulching paper film that can suppress the death and growth of crops by suppressing the environment in which weeds grow while preventing the high temperature of the soil due to its excellent reflectivity, breathability, moisture permeability, and moisture resistance. the current situation.

US Patent Publication No. 4,929,303 (May 29, 1999)

The present invention has been devised to solve the above problems, and has excellent mechanical properties such as tensile strength and elongation, and has excellent durability while improving air permeability and waterproofness as well as heat blocking properties, thereby maximizing cooling and heating and energy saving efficiency. An object of the present invention is to provide an agricultural mulching laminated film that can be made.

In addition, the present invention is to provide an agricultural mulching laminated film capable of exhibiting a herbicidal effect by absorbing transmitted light while suppressing thermal shock of crops by more effectively preventing soil temperature by increasing the reflectivity of direct sunlight.

In addition, the present invention is to provide an agricultural mulching laminated film that has moisture permeability/breathability to allow the inflow and outflow of water vapor and air, and prevents soil overhumidity by blocking the inflow of moisture due to rainfall.

The present invention is a double black and white mulching laminated film obtained by laminating a white film layer of a resin composition containing titanium dioxide and a black film layer of a resin composition containing carbon black, wherein the white film layer has (a) a density of 0.910 to 0.925 g/cm ³ linear low-density polyethylene (b) linear low-density polyethylene having a density of 0.930 to 0.940 g/cm ³ , (c) melt index (190° C., 2.16 kg) according to ASTM D 1238 of 5 to 10 g/10 min It is made of a composition containing low-density polyethylene, (d) calcium carbonate surface-coated with a saturated fatty acid of C ₉ to C ₂₄ and (e) titanium dioxide, and the black film layer has (a) a density of 0.910 to 0.925 g/ cm ³ linear low-density polyethylene (b) linear low-density polyethylene having a density of 0.930 to 0.940 g/cm ³ , (c) low-density polyethylene having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) C ₉ to C ₂₄ It provides a porous agricultural double black and white mulching laminated film made of a composition containing calcium carbonate surface-coated with saturated fatty acids and (e) carbon black.

According to an aspect of the present invention, the white film layer has (a) a density of 0.910 to 0.925 g/cm ³ with respect to 100 parts by weight of a linear low density polyethylene, (b) a density of 0.930 to 0.940 g/cm ³ A linear low density 10 to 40 parts by weight of a polyethylene resin, (c) 10 to 40 parts by weight of a low-density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) C ₉ to C ₂₄ It may be prepared including 10 to 200 parts by weight of calcium carbonate surface-coated with saturated fatty acid and (f) 3 to 10 parts by weight of titanium dioxide.

According to an aspect of the present invention, the black film layer is (a) with respect to 100 parts by weight of a linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , (b) a linear low-density having a density of 0.930 to 0.940 g/cm ³ 10 to 40 parts by weight of a polyethylene resin, (c) 10 to 40 parts by weight of a low-density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) C ₉ to C ₂₄ It may be prepared including 10 to 50 parts by weight of calcium carbonate surface-coated with saturated fatty acid and (e) 1 to 200 parts by weight of carbon black.

According to an aspect of the present invention, the calcium carbonate may have an average particle diameter of 1 to 5 μm and a maximum particle diameter of 10 μm or less.

According to an aspect of the present invention, the porous agricultural double black and white mulching laminated film may further include an ionomer.

According to an aspect of the present invention, the porous agricultural mulching laminated film may have a basis weight of 10 to 150 g/m 2 and a moisture permeability of 4,000 to 15,000 g/m 2 24hr.

According to an aspect of the present invention, (a) with respect to 100 parts by weight of linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ by weight, 10 to 40 parts by weight of a low-density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, 80 to 200 parts by weight of calcium carbonate surface-coated with C ₉ to C ₂₄ fatty acids, dioxide 3 to 10 parts by weight of titanium, 0.1 to 10 parts by weight of metallic stearic acid, 1 to 10 parts by weight of a UV inhibitor, and 0.1 to 10 parts by weight of an antioxidant are mixed and melt-extruded to provide a first resin composition; (b) With respect to 100 parts by weight of linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ by weight, the melt index according to ASTM D 1238 ( 190 ° C., 2.16 kg) containing 10 to 40 parts by weight of a low-density polyethylene resin of 5 to 10 g/10 min, 10 to 50 parts by weight of calcium carbonate surface-coated with C ₉ to C ₂₄ saturated fatty acids, and 1 to 200 parts by weight of carbon black parts, 0.1 to 10 parts by weight of metallic stearic acid, 1 to 10 parts by weight of a UV inhibitor, and 0.1 to 10 parts by weight of an antioxidant to provide a second resin composition by mixing and melt-extruding; (c) putting the obtained first resin composition and the second resin composition into a film processing machine equipped with two extruders and a two-layer die, and extruding the first resin composition and the second resin composition with each extruder; (d) the first resin composition and the second resin composition to be extruded and discharged are melted and adhered in a two-layer die to prepare a double-layered laminate film; porous agricultural double black and white mulching laminated film manufacturing method comprising can provide

The porous agricultural double black and white mulching laminated film according to the present invention reflects direct sunlight in the white film layer to suppress the rise in soil temperature and at the same time has excellent moisture permeability. It has a very good inhibitory effect.

In addition, the porous agricultural double black and white mulching laminated film according to the present invention is composed of a double layer structure, and the white film layer reflects direct sunlight to suppress the increase in the temperature of the soil, and the black film layer has the white film layer By absorbing the transmitted light, it is possible to suppress the growth of weeds, thereby providing a very suitable environment for the growth of crops.

In addition, the porous agricultural double black and white mulching laminated film according to the present invention further includes an ionomer, so that the mixing between each composition becomes more uniform, so that processing is smooth and mechanical strength is also excellent, and in particular, the porous agricultural double black and white mulching laminated film As the waterproofing pressure of the plant is significantly increased, it has the effect of reducing damage to crops due to rain when used as a mulching film.

1 is a schematic diagram of a porous agricultural double black and white mulch laminated film.

Hereinafter, the present invention will be described in more detail through embodiments or examples including the accompanying drawings. However, the following specific examples or examples are only a reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Also, unless defined otherwise, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of effectively describing particular embodiments only and is not intended to limit the invention.

Also, the singular forms used in the specification and appended claims may also be intended to include the plural forms unless the context specifically dictates otherwise.

Also, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

The conventional mulching film has low moisture permeability and breathability, or, conversely, has disadvantages such as durability and heavy weight. It could be over-humidified soil because it could not be applied harmoniously, and there was a disadvantage of causing damage to the soil at high temperatures, especially when using a black mulching film for weeding.

All of the above problems were solved by providing a double black and white mulching laminated film for porous agriculture of the present invention.

The porous agricultural double black and white mulching laminated film of the present invention is a double black and white mulching laminated film obtained by laminating a white film layer of a resin composition containing titanium dioxide and a black film layer of a resin composition containing carbon black.

The white film layer is (a) a linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ (b) a linear low-density polyethylene having a density of 0.930 to 0.940 g/cm ³ , (c) a melt index according to ASTM D 1238 (190 ℃, 2.16kg) of 5 to 10g/10min of low-density polyethylene, (d) C ₉ to C ₂₄ It is prepared with a composition containing calcium carbonate and (e) titanium dioxide surface-coated with saturated fatty acids,

The black film layer is (a) a linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ (b) a linear low-density polyethylene having a density of 0.930 to 0.940 g/cm ³ , (c) a melt index according to ASTM D 1238 (190 ℃, 2.16kg) of 5 to 10g/10min of low-density polyethylene, (d) C ₉ to C ₂₄ The surface-coated calcium carbonate with a saturated fatty acid, and (e) a composition containing carbon black.

In the present invention, the mulching film has a double layer structure, the upper layer constitutes a white film layer, and the lower layer constitutes a black film layer, so that the soil temperature rise can be effectively suppressed due to direct sunlight reflection, excellent moisture permeability and waterproofing pressure. Therefore, it is possible to control the soil temperature in summer, and it can also effectively suppress weed growth.

Specifically, the mulching film uses linear low-density polyethylene as a main component, and by adopting a linear low-density polyethylene resin having a low density and another density and calcium carbonate surface-treated with fatty acids, the calcium carbonate is dispersed between the particles and the resin. The interface is well controlled, and due to the formation of micropores, water penetration can be controlled, so that excessive moisture in the soil is prevented even during rain, and oxygen and air permeate well, thereby promoting plant growth.

In addition, in the present invention, by mixing titanium dioxide with calcium carbonate, it has the effect of exhibiting excellent UV protection properties.

According to an aspect of the present invention, the white film layer has (a) a density of 0.910 to 0.925 g/cm ³ with respect to 100 parts by weight of a linear low density polyethylene, (b) a density of 0.930 to 0.940 g/cm ³ A linear low density 10 to 40 parts by weight of a polyethylene resin, (c) 10 to 40 parts by weight of a low-density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) C ₉ to C ₂₄ It can be prepared by including 10 to 200 parts by weight of calcium carbonate surface-coated with saturated fatty acid and (f) 3 to 10 parts by weight of titanium dioxide.

In addition, according to an aspect of the present invention, the black film layer is (a) with respect to 100 parts by weight of linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , (b) a linear density of 0.930 to 0.940 g/cm ³ 10 to 40 parts by weight of a low density polyethylene resin, (c) 10 to 40 parts by weight of a low density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) C ₉ to C ₂₄ 10 to 50 parts by weight of calcium carbonate surface-coated with a saturated fatty acid of (e) 1 to 200 parts by weight of carbon black.

The white film layer and the black film layer prepared with the above composition content lower the temperature inside the soil due to the heat of vaporization absorbed when water vaporizes, so that plants can grow well. In addition, the porous agricultural double black-and-white mulching laminated film contains fatty acid surface-treated calcium carbonate and titanium dioxide, so it has a function of blocking ultraviolet rays and gives a function of blocking harmful ultraviolet rays. Of course, the porous agricultural double black-and-white mulching laminated film may further include a sunscreen agent.

In the present invention, when the resin component constituting the substrate includes high-density polyethylene or polypropylene, porosity appears excessively, and in particular, in the case of polypropylene, it is difficult to process due to crystallinity.

When the porosity is excessively generated, excessive moisture penetrates inside during the rainy season and becomes over-humidified, which inhibits plant growth, which is also not good, and it is not easy to maintain a certain amount of moisture in the soil.

In the present invention, when the calcium carbonate surface-treated with the fatty acid is used, it is combined with the linear low-density and low-density polyethylene mixed resin component constituting the substrate to maintain a constant moisture level, and the dispersion of calcium carbonate becomes uniform, resulting in localized large pores. It is good to prevent the penetration of excessive water due to the occurrence of

That is, in the present invention, an appropriate interface is formed at the interface of inorganic particles by mixing a mixed resin with low-density polyethylene as a main component, calcium carbonate surface-treated with fatty acid, and a certain amount of titanium dioxide. It is shown to impart complex properties such as moisture permeability, breathability, moisture-proof property, light reflection properties, infrared reflection reduction and suppression of earth temperature increase to the porous agricultural mulching laminate film.

As long as the calcium carbonate according to an embodiment of the present invention is surface-treated with a fatty acid, the calcium carbonate is talc, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, calcium chloride, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, oxide Titanium, alumina, mica, asbestos powder, zeolite, may be replaced with any one or more inorganic particles selected from silicate clay, or may be further included.

In addition, the average particle size of the calcium carbonate according to an embodiment of the present invention may be 1 to 5 μm, preferably 2 to 4 μm, more preferably 2 to 3 μm, but must be limited thereto it's not going to be

In addition, the maximum particle size of the calcium carbonate according to an embodiment of the present invention may be 15 μm, preferably 12 μm, more preferably 10 μm, but is not necessarily limited thereto.

As the calcium carbonate satisfies both the average particle size and the maximum particle size, the pore uniformity of the double black and white mulching laminated film for porous agriculture is excellent, moisture can be uniformly radiated to the outside, and the temperature of the soil due to the heat of vaporization is further lowered can have a significant effect.

In addition, it is possible to effectively prevent water absorption into the porous agricultural double black-and-white mulching laminated film during heavy rain, thereby suppressing necrosis of the roots of crops due to excessive moisture.

In addition, the porous agricultural double black and white mulching laminated film according to an embodiment of the present invention may further include an ionomer. The ionomer may include an ethylene-unsaturated carboxylic acid copolymer containing metal ions. In this case, the ionomer has a structure in which the carboxylic acid group of the copolymer is neutralized by a metal ion.

For a specific example, the ethylene-unsaturated carboxylic acid copolymer is any one or two or more selected from an ethylene-maleic acid copolymer, an ethylene-maleic anhydride copolymer, an ethylene-acrylic acid copolymer, and ethylene-methacrylic acid. may include The metal ion may be one or two or more selected from alkali metals, alkaline earth metals and transition metals. When the ionomer as described above is further included, the mixability between the substrates is further improved, and the adhesion between the white film layer and the black film layer is improved.

In addition, as the ionomo is further included, the porous agricultural mulching laminated film has excellent mechanical strength, so that the moisture permeability is further improved without being damaged even at a high waterproofing pressure.

The porous agricultural double black and white mulch laminated film according to an embodiment of the present invention may have a basis weight of 10 to 150 g/m2, and a moisture permeability of 5,000 to 15,000 g/m224hr, preferably a basis weight of 15 to 120 g/m2 and may have a moisture permeability of 5,000 to 11,000 g/m 24 hr, more preferably a basis weight of 20 to 90 g/m, and a moisture permeability of 6,000 to 10,000 g/m 24 hr, but is not necessarily limited thereto.

By satisfying the basis weight and moisture permeability, a synergistic effect with the direct sunlight reflection effect of the white film layer can be generated, so that the temperature inside the soil can be dramatically lowered, and on the contrary, water or rain is difficult to penetrate into the soil, Inhibition of plant growth due to excessive moisture content can be prevented.

The resin composition used to prepare the porous agricultural double black and white mulching laminated film may further include 0.1 to 20 parts by weight of an antioxidant and 0.1 to 20 parts by weight of a UV stabilizer based on 100 parts by weight of the base resin. Any additives such as lubricants, flame retardants, and antibacterial agents may be used without limitation.

The porous agricultural double black and white mulching laminated film is not particularly limited, but the puncture strength may be 400 gf or more, specifically 450 gf or more, and more specifically 500 gf or more. The upper limit is not limited, but may be, for example, 1,000 gf. In the case of having a puncture strength within the above range, the thin film formation of the porous substrate may be facilitated, and the mechanical strength of the composite porous separator may be improved, which may be more preferable.

In addition, the thickness of the porous agricultural double black and white mulching laminated film is not limited, but may be 1 to 100 μm, specifically 5 to 50 μm, and more specifically 6 to 30 μm. The thickness of the breathable substrate is not limited, but may be 1 to 100 μm, specifically 5 to 50 μm, and more specifically 6 to 30 μm.

According to an aspect of the present invention, (a) with respect to 100 parts by weight of linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ by weight, 10 to 40 parts by weight of a low-density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, 80 to 200 parts by weight of calcium carbonate surface-coated with C ₉ to C ₂₄ fatty acids, dioxide 3 to 10 parts by weight of titanium, 0.1 to 10 parts by weight of metallic stearic acid, 1 to 10 parts by weight of a UV inhibitor, and 0.1 to 10 parts by weight of an antioxidant are mixed and melt-extruded to provide a first resin composition;

(b) With respect to 100 parts by weight of linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ by weight, the melt index according to ASTM D 1238 ( 190 ° C., 2.16 kg) containing 10 to 40 parts by weight of a low-density polyethylene resin of 5 to 10 g/10 min, 10 to 50 parts by weight of calcium carbonate surface-coated with C ₉ to C ₂₄ saturated fatty acids, and 1 to 200 parts by weight of carbon black parts, 0.1 to 10 parts by weight of metallic stearic acid, 1 to 10 parts by weight of a UV inhibitor, and 0.1 to 10 parts by weight of an antioxidant to provide a second resin composition by mixing and melt-extruding;

(c) putting the obtained first resin composition and the second resin composition into a film processing machine equipped with two extruders and a two-layer die, and extruding the first resin composition and the second resin composition with each extruder;

(d) the first resin composition and the second resin composition to be extruded and discharged are melted and adhered in a two-layer die to prepare a double-layered laminate film; porous agricultural double black and white mulching laminated film manufacturing method comprising to provide.

Since the composition and content of the composition have been described above, it is not described therein.

As a step of obtaining a sheet by putting the resin composition prepared in steps a) and b) into a film processing machine equipped with two extruders and a two-layer die of step c), the melting temperature may be 200 to 300° C., The sheet may be manufactured using a T-die forming machine, but the method for manufacturing the sheet is not limited.

The prepared sheet may be prepared through a stretching process to prepare a porous polyolefin substrate. The stretching may be performed at a stretching temperature of 50 to 100° C., and the stretching ratio may be 2 to 4 times, but is not limited thereto.

In step d), the first resin composition and the second resin composition are melted and adhered in a two-layer die to prepare a double-layered laminate film, and the melt-bonding temperature may be 100 to 300 ° C. It is not limited.

Since the average particle diameter or the maximum particle diameter of the nonwoven fabric and calcium carbonate described above has already been described in the present invention, it is omitted here.

Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples. However, the following Examples and Comparative Examples are only examples for explaining the present invention in more detail, and the present invention is not limited by the following Examples and Comparative Examples.

[Example 1]

100 parts by weight of the first linear low-density polyethylene resin (FT850, density 0.919 g/cm ³ _, SKI), 25 parts by weight of the second linear low-density polyethylene resin (FT811, density 0.932 g/cm ³ _, SKI), low-density polyethylene (DOW, LD777) ) 25 parts by weight, 135 parts by weight of calcium carbonate (Lexem, ST5000) having an average particle diameter of 2.2 μm and a maximum particle diameter of 10 μm or less, titanium dioxide (CR-834, MW Chemical) 4 parts by weight, calcium stearate (ca- st, MW Chemical) 1 part by weight, first sunscreen (UV119, SABO STAB (PolyAdchem)) 1.5 parts by weight, second sunscreen agent (UV62, SABO STAB (PolyAdchem)) 1.5 parts by weight, first oxidation After mixing 0.7 parts by weight of the antioxidant (Alkanox240, Songwon Industry) and the second antioxidant (1790, Asia additive), put it in a Hensel mixer, mix it, and inject it into a twin-screw extruder with a screw diameter of 130 mm and melt-extruded at 230 ° C. A first resin composition in a pellet state was obtained.

100 parts by weight of the first linear low-density polyethylene resin (FT850, density 0.919 g/cm ³ _, SKI), 25 parts by weight of the second linear low-density polyethylene resin (FT811, density 0.932 g/cm ³ _, SKI), low-density polyethylene (DOW, LD777) ) 25 parts by weight, 35 parts by weight of calcium carbonate (Lexem, ST5000) having an average particle diameter of 2.2 μm and a maximum particle diameter of 10 μm or less, 100 parts by weight of carbon black, 1 part by weight of calcium stearate (ca-st, MW chemical) treated with stearic acid , 1.5 parts by weight of the first sunscreen (UV119, SABO STAB (Poly Adchem)) 1.5 parts by weight of the second sunscreen (UV62, SABO STAB (Poly Adchem)) 1.5 parts by weight of the first antioxidant (Alkanox240, Songwon Industrial) 0.7 After mixing parts by weight and the second antioxidant (1790, Asian additive), put it in a Henschel mixer and mix it, inject it into a twin-screw extruder having a screw diameter of 130 mm, and melt-extruded at 230° C. to obtain a second resin composition in a pellet state obtained.

The obtained first and second resin compositions were put into a film processing machine equipped with two extruders and a two-layer die, and the first and second resin compositions were extruded with each extruder. The temperature of the extruders was maintained at 200 °C.

The first and second resin compositions extruded and discharged were melted and adhered in a two-layer die to prepare a double-layered laminate sheet. The sheet was uniaxially stretched three times at a stretching temperature of 70° C. to prepare a porous agricultural double black and white mulching film.

The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Example 2]

Example 1 was carried out in the same manner except that 1 part by weight of the ionomer was further included in each of the first resin composition and the second resin composition.

The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Example 3]

In Example 1, the same procedure was performed except that the maximum particle diameter of the calcium carbonate was 20 μm or less and the average particle diameter was 2.2 μm.

The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Comparative Example 1]

Example 1 was carried out in the same manner except that 50 parts by weight of linear low-density polyethylene FT811 was used without using low-density polyethylene. The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Comparative Example 2]

In Example 1, the same procedure was performed except that calcium carbonate of the same average particle diameter was used without surface treatment of stearic acid. The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Comparative Example 3]

Example 1 was carried out in the same manner except that titanium dioxide was not used. The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Method for evaluating physical properties]

1. Waterproof pressure: Measured by JIS L1092 method.

2. Moisture permeability: It was measured by the JIS Z0208 method.

3. Measurement of reflectance from 400 to 700 nm: KS L 2514

4. Evaluation of over-wetting: When 1 kg of soil was wrapped with a mulching film and placed in water for 5 hours, over-wetting was measured through Equation 1 below.

[Equation 1]

(When the value of over-humidity in Equation 1 above is 60: stagnant

When the value of over-moisture in Equation 1 is less than 60 and 50 or more: Wet

When the value of over-moisture in Formula 1 is less than 50 and greater than 40: Moist

When the value of over-moisture in Formula 1 is greater than or equal to 30 and less than 40: Less moist

When the value of over-humidity in Formula 1 is less than 30: dry)

Waterproof pressure (kpa) Basis weight (g/㎡) Moisture permeability (g/㎡*24hrs) 400-700nm reflectance Excessive moisture Example 1 35 82 9,120 70-80% moist Example 2 40 82 9,130 70-80% moist Example 3 32 84 9,000 70-75% wet Comparative Example 1 27 90 4,000 70-75% dry Comparative Example 2 32 81 3,500 70-75% high Comparative Example 3 34 79 5,400 70-75% less moist

As shown in the table above, the film of the present invention has an appropriate waterproofing pressure, and in particular, the moisture permeability is 6000 g/m2*24hrs or more and the upper layer has excellent reflectance due to the white layer film, so that water vapor including heat of vaporization is smoothly discharged to the outside. It can provide a good environment for plant growth even in summer by suppressing soil temperature.

In addition, when immersed in water, it is possible to prevent excessive moisture from being absorbed into the inner ridges due to the excellent waterproofness, which shows the effect that water does not pass through and does not become over-humidified.

As described above, the present invention has been described with specific matters and limited examples and drawings, but these are only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention is not limited to the above embodiments. Various modifications and variations are possible from these descriptions by those of ordinary skill in the art.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims to be described later, but also all those with equivalent or equivalent modifications to the claims will be said to belong to the scope of the spirit of the present invention. .

100: porous agricultural double black and white mulching laminated film 101: white film layer 102: black film layer

Claims (7)

As a double black and white mulching laminated film obtained by laminating a white film layer of a resin composition containing titanium dioxide and a black film layer of a resin composition containing carbon black, the white film layer has (a) a density of 0.910 to 0.925 g/ cm ³ linear low-density polyethylene (b) linear low-density polyethylene having a density of 0.930 to 0.940 g/cm ³ , (c) low-density polyethylene having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) C ₉ to C ₂₄ A surface-coated calcium carbonate with a saturated fatty acid and (e) a composition containing titanium dioxide, wherein the black film layer is (a) having a density of 0.910 to 0.925 g/cm ³ Linear low-density polyethylene (b) Linear low-density polyethylene having a density of 0.930 to 0.940 g/cm ³ , (c) Low-density polyethylene having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) C ₉ to C ₂₄ A double black-and-white mulching laminated film for porous agriculture, which is prepared from a composition containing calcium carbonate surface-coated with saturated fatty acids and (e) carbon black. According to claim 1, The white film layer is (a) with respect to 100 parts by weight of the linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , (b) a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ 10 to 40 parts by weight, (c) 10 to 40 parts by weight of a low-density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) C ₉ to C ₂₄ saturated fatty acid 10 to 200 parts by weight of calcium carbonate and (f) titanium dioxide 3 to 10 parts by weight of the surface-coated, porous agricultural double black-and-white mulching laminated film. According to claim 1, The black film layer (a) with respect to 100 parts by weight of linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , (b) a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ 10 to 40 parts by weight, (c) 10 to 40 parts by weight of a low-density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) C ₉ to C ₂₄ saturated fatty acid 10 to 50 parts by weight of calcium carbonate surface-coated with (e) 1 to 200 parts by weight of carbon black, the porous agricultural double black-and-white mulching laminated film. The porous agricultural mulching laminated film according to claim 1, wherein the calcium carbonate has an average particle diameter of 1 to 5 μm and a maximum particle diameter of 10 μm or less. According to claim 1, The porous agricultural double black-and-white mulching laminated film is a porous agricultural double black-and-white mulching laminated film further comprising an ionomer. According to claim 1, The porous agricultural mulching laminated film has a basis weight of 10 to 150 g / ㎡, and a moisture permeability of 4,000 to 15,000 g / ㎡ 24hr porous agricultural mulching laminated film. (a) with respect to 100 parts by weight of linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ , melt index according to ASTM D 1238 ( 190 ° C., 2.16 kg) of 5 to 10 g/10 min 10 to 40 parts by weight of a low-density polyethylene resin, 80 to 200 parts by weight of calcium carbonate surface-coated with C ₉ to C ₂₄ fatty acids, 3 to 10 parts by weight of titanium dioxide, metal 0.1 to 10 parts by weight of stearic acid, 1 to 10 parts by weight of a UV inhibitor, and 0.1 to 10 parts by weight of an antioxidant are mixed and melt-extruded to provide a first resin composition; (b) a linear density of 0.910 to 0.925 g/cm ³ With respect to 100 parts by weight of low-density polyethylene, 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ , a low-density low-density resin having a melt index (190°C, 2.16kg) according to ASTM D 1238 of 5 to 10 g/10min 10 to 40 parts by weight of polyethylene resin, 10 to 50 parts by weight of calcium carbonate surface-coated with C ₉ to C ₂₄ saturated fatty acids, 1 to 200 parts by weight of carbon black, 0.1 to 10 parts by weight of metal stearic acid, 1 to 1 to UV inhibitor Mixing 10 parts by weight and 0.1 to 10 parts by weight of an antioxidant and melt-extruding to provide a second resin composition; The first resin composition and the second resin composition are extruded by each extruder; (d) the first resin composition and the second resin composition that are extruded and discharged are melted and adhered in a two-layer die A porous agricultural double black and white mulching laminated film manufacturing method comprising;

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